POPM 3240 Lecture 10: popm unit 4.1

• School: University of Guelph
• Department: Population Medicine
• Course: POPM 3240
• Professor: Andrea Jones- Bitton

Document Summary

Morbidity and mortality: morbidity refers to a diseased state and often considers the burden of disease, such as sickness or impairment, mortality refers to death. Two of the most common measurements in epidemiology are prevalence and incidence: prevalence refers to the number of existing cases of disease (at a given time) divided by the number of persons in the population at that time. Incidence risk is the proportion of unaffected individuals (those who do not have the disease) who, on average, develop the disease/outcome over a specific time period. Ir = (# of new cases in a specified time period) / [initial number at risk (nar) - (withdrawals) Irr = (# of new cases in a population during a specified time period) / (net time individuals in a population are at-risk during time) Often we only have summary data available for a group. Thus, we calculate incidence rate with an approximate denominator.